GData (Google Data Protocol) provides a simple protocol for reading and writing data on the Internet, designed by Google. GData combines common XML-based syndication formats (Atom and RSS) with a feed-publishing system based on the Atom Publishing Protocol, plus some extensions for handling queries. It relies on XML or JSON as a data format.
According to the Google Developers portal, "The Google Data Protocol is a REST-inspired technology for reading, writing, and modifying information on the web. It is used in some older Google APIs."[3] However, "Most Google APIs are not Google Data APIs."[3]
Google provides GData client libraries for Java, JavaScript, .NET, PHP, Python,[1] and Objective-C.[2]
An implementation called libgdata written in C is available under the LGPL license.
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